1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2013 Nicira, Inc. 4 */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 8 #include <linux/types.h> 9 #include <linux/kernel.h> 10 #include <linux/skbuff.h> 11 #include <linux/netdevice.h> 12 #include <linux/in.h> 13 #include <linux/if_arp.h> 14 #include <linux/init.h> 15 #include <linux/in6.h> 16 #include <linux/inetdevice.h> 17 #include <linux/netfilter_ipv4.h> 18 #include <linux/etherdevice.h> 19 #include <linux/if_ether.h> 20 #include <linux/if_vlan.h> 21 #include <linux/static_key.h> 22 23 #include <net/ip.h> 24 #include <net/icmp.h> 25 #include <net/protocol.h> 26 #include <net/ip_tunnels.h> 27 #include <net/ip6_tunnel.h> 28 #include <net/ip6_checksum.h> 29 #include <net/arp.h> 30 #include <net/checksum.h> 31 #include <net/dsfield.h> 32 #include <net/inet_ecn.h> 33 #include <net/xfrm.h> 34 #include <net/net_namespace.h> 35 #include <net/netns/generic.h> 36 #include <net/rtnetlink.h> 37 #include <net/dst_metadata.h> 38 #include <net/geneve.h> 39 #include <net/vxlan.h> 40 #include <net/erspan.h> 41 42 const struct ip_tunnel_encap_ops __rcu * 43 iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly; 44 EXPORT_SYMBOL(iptun_encaps); 45 46 const struct ip6_tnl_encap_ops __rcu * 47 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly; 48 EXPORT_SYMBOL(ip6tun_encaps); 49 50 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, 51 __be32 src, __be32 dst, __u8 proto, 52 __u8 tos, __u8 ttl, __be16 df, bool xnet, 53 u16 ipcb_flags) 54 { 55 int pkt_len = skb->len - skb_inner_network_offset(skb); 56 struct net *net = dev_net(rt->dst.dev); 57 struct net_device *dev = skb->dev; 58 struct iphdr *iph; 59 int err; 60 61 skb_scrub_packet(skb, xnet); 62 63 skb_clear_hash_if_not_l4(skb); 64 skb_dst_set(skb, &rt->dst); 65 memset(IPCB(skb), 0, sizeof(*IPCB(skb))); 66 IPCB(skb)->flags = ipcb_flags; 67 68 /* Push down and install the IP header. */ 69 skb_push(skb, sizeof(struct iphdr)); 70 skb_reset_network_header(skb); 71 72 iph = ip_hdr(skb); 73 74 iph->version = 4; 75 iph->ihl = sizeof(struct iphdr) >> 2; 76 iph->frag_off = ip_mtu_locked(&rt->dst) ? 0 : df; 77 iph->protocol = proto; 78 iph->tos = tos; 79 iph->daddr = dst; 80 iph->saddr = src; 81 iph->ttl = ttl; 82 __ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1); 83 84 err = ip_local_out(net, sk, skb); 85 86 if (dev) { 87 if (unlikely(net_xmit_eval(err))) 88 pkt_len = 0; 89 iptunnel_xmit_stats(dev, pkt_len); 90 } 91 } 92 EXPORT_SYMBOL_GPL(iptunnel_xmit); 93 94 int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len, 95 __be16 inner_proto, bool raw_proto, bool xnet) 96 { 97 if (unlikely(!pskb_may_pull(skb, hdr_len))) 98 return -ENOMEM; 99 100 skb_pull_rcsum(skb, hdr_len); 101 102 if (!raw_proto && inner_proto == htons(ETH_P_TEB)) { 103 struct ethhdr *eh; 104 105 if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) 106 return -ENOMEM; 107 108 eh = (struct ethhdr *)skb->data; 109 if (likely(eth_proto_is_802_3(eh->h_proto))) 110 skb->protocol = eh->h_proto; 111 else 112 skb->protocol = htons(ETH_P_802_2); 113 114 } else { 115 skb->protocol = inner_proto; 116 } 117 118 skb_clear_hash_if_not_l4(skb); 119 __vlan_hwaccel_clear_tag(skb); 120 skb_set_queue_mapping(skb, 0); 121 skb_scrub_packet(skb, xnet); 122 123 return iptunnel_pull_offloads(skb); 124 } 125 EXPORT_SYMBOL_GPL(__iptunnel_pull_header); 126 127 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md, 128 gfp_t flags) 129 { 130 IP_TUNNEL_DECLARE_FLAGS(tun_flags) = { }; 131 struct metadata_dst *res; 132 struct ip_tunnel_info *dst, *src; 133 134 if (!md || md->type != METADATA_IP_TUNNEL || 135 md->u.tun_info.mode & IP_TUNNEL_INFO_TX) 136 return NULL; 137 138 src = &md->u.tun_info; 139 res = metadata_dst_alloc(src->options_len, METADATA_IP_TUNNEL, flags); 140 if (!res) 141 return NULL; 142 143 dst = &res->u.tun_info; 144 dst->key.tun_id = src->key.tun_id; 145 if (src->mode & IP_TUNNEL_INFO_IPV6) 146 memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src, 147 sizeof(struct in6_addr)); 148 else 149 dst->key.u.ipv4.dst = src->key.u.ipv4.src; 150 ip_tunnel_flags_copy(dst->key.tun_flags, src->key.tun_flags); 151 dst->mode = src->mode | IP_TUNNEL_INFO_TX; 152 ip_tunnel_info_opts_set(dst, ip_tunnel_info_opts(src), 153 src->options_len, tun_flags); 154 155 return res; 156 } 157 EXPORT_SYMBOL_GPL(iptunnel_metadata_reply); 158 159 int iptunnel_handle_offloads(struct sk_buff *skb, 160 int gso_type_mask) 161 { 162 int err; 163 164 if (likely(!skb->encapsulation)) { 165 skb_reset_inner_headers(skb); 166 skb->encapsulation = 1; 167 } 168 169 if (skb_is_gso(skb)) { 170 err = skb_header_unclone(skb, GFP_ATOMIC); 171 if (unlikely(err)) 172 return err; 173 skb_shinfo(skb)->gso_type |= gso_type_mask; 174 return 0; 175 } 176 177 if (skb->ip_summed != CHECKSUM_PARTIAL) { 178 skb->ip_summed = CHECKSUM_NONE; 179 /* We clear encapsulation here to prevent badly-written 180 * drivers potentially deciding to offload an inner checksum 181 * if we set CHECKSUM_PARTIAL on the outer header. 182 * This should go away when the drivers are all fixed. 183 */ 184 skb->encapsulation = 0; 185 } 186 187 return 0; 188 } 189 EXPORT_SYMBOL_GPL(iptunnel_handle_offloads); 190 191 /** 192 * iptunnel_pmtud_build_icmp() - Build ICMP error message for PMTUD 193 * @skb: Original packet with L2 header 194 * @mtu: MTU value for ICMP error 195 * 196 * Return: length on success, negative error code if message couldn't be built. 197 */ 198 static int iptunnel_pmtud_build_icmp(struct sk_buff *skb, int mtu) 199 { 200 const struct iphdr *iph = ip_hdr(skb); 201 struct icmphdr *icmph; 202 struct iphdr *niph; 203 struct ethhdr eh; 204 int len, err; 205 206 if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr))) 207 return -EINVAL; 208 209 skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN); 210 pskb_pull(skb, ETH_HLEN); 211 skb_reset_network_header(skb); 212 213 err = pskb_trim(skb, 576 - sizeof(*niph) - sizeof(*icmph)); 214 if (err) 215 return err; 216 217 len = skb->len + sizeof(*icmph); 218 err = skb_cow(skb, sizeof(*niph) + sizeof(*icmph) + ETH_HLEN); 219 if (err) 220 return err; 221 222 icmph = skb_push(skb, sizeof(*icmph)); 223 *icmph = (struct icmphdr) { 224 .type = ICMP_DEST_UNREACH, 225 .code = ICMP_FRAG_NEEDED, 226 .checksum = 0, 227 .un.frag.__unused = 0, 228 .un.frag.mtu = htons(mtu), 229 }; 230 icmph->checksum = csum_fold(skb_checksum(skb, 0, len, 0)); 231 skb_reset_transport_header(skb); 232 233 niph = skb_push(skb, sizeof(*niph)); 234 *niph = (struct iphdr) { 235 .ihl = sizeof(*niph) / 4u, 236 .version = 4, 237 .tos = 0, 238 .tot_len = htons(len + sizeof(*niph)), 239 .id = 0, 240 .frag_off = htons(IP_DF), 241 .ttl = iph->ttl, 242 .protocol = IPPROTO_ICMP, 243 .saddr = iph->daddr, 244 .daddr = iph->saddr, 245 }; 246 ip_send_check(niph); 247 skb_reset_network_header(skb); 248 249 skb->ip_summed = CHECKSUM_NONE; 250 251 eth_header(skb, skb->dev, ntohs(eh.h_proto), eh.h_source, eh.h_dest, 0); 252 skb_reset_mac_header(skb); 253 254 return skb->len; 255 } 256 257 /** 258 * iptunnel_pmtud_check_icmp() - Trigger ICMP reply if needed and allowed 259 * @skb: Buffer being sent by encapsulation, L2 headers expected 260 * @mtu: Network MTU for path 261 * 262 * Return: 0 for no ICMP reply, length if built, negative value on error. 263 */ 264 static int iptunnel_pmtud_check_icmp(struct sk_buff *skb, int mtu) 265 { 266 const struct icmphdr *icmph = icmp_hdr(skb); 267 const struct iphdr *iph = ip_hdr(skb); 268 269 if (mtu < 576 || iph->frag_off != htons(IP_DF)) 270 return 0; 271 272 if (ipv4_is_lbcast(iph->daddr) || ipv4_is_multicast(iph->daddr) || 273 ipv4_is_zeronet(iph->saddr) || ipv4_is_loopback(iph->saddr) || 274 ipv4_is_lbcast(iph->saddr) || ipv4_is_multicast(iph->saddr)) 275 return 0; 276 277 if (iph->protocol == IPPROTO_ICMP && icmp_is_err(icmph->type)) 278 return 0; 279 280 return iptunnel_pmtud_build_icmp(skb, mtu); 281 } 282 283 #if IS_ENABLED(CONFIG_IPV6) 284 /** 285 * iptunnel_pmtud_build_icmpv6() - Build ICMPv6 error message for PMTUD 286 * @skb: Original packet with L2 header 287 * @mtu: MTU value for ICMPv6 error 288 * 289 * Return: length on success, negative error code if message couldn't be built. 290 */ 291 static int iptunnel_pmtud_build_icmpv6(struct sk_buff *skb, int mtu) 292 { 293 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 294 struct icmp6hdr *icmp6h; 295 struct ipv6hdr *nip6h; 296 struct ethhdr eh; 297 int len, err; 298 __wsum csum; 299 300 if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr))) 301 return -EINVAL; 302 303 skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN); 304 pskb_pull(skb, ETH_HLEN); 305 skb_reset_network_header(skb); 306 307 err = pskb_trim(skb, IPV6_MIN_MTU - sizeof(*nip6h) - sizeof(*icmp6h)); 308 if (err) 309 return err; 310 311 len = skb->len + sizeof(*icmp6h); 312 err = skb_cow(skb, sizeof(*nip6h) + sizeof(*icmp6h) + ETH_HLEN); 313 if (err) 314 return err; 315 316 icmp6h = skb_push(skb, sizeof(*icmp6h)); 317 *icmp6h = (struct icmp6hdr) { 318 .icmp6_type = ICMPV6_PKT_TOOBIG, 319 .icmp6_code = 0, 320 .icmp6_cksum = 0, 321 .icmp6_mtu = htonl(mtu), 322 }; 323 skb_reset_transport_header(skb); 324 325 nip6h = skb_push(skb, sizeof(*nip6h)); 326 *nip6h = (struct ipv6hdr) { 327 .priority = 0, 328 .version = 6, 329 .flow_lbl = { 0 }, 330 .payload_len = htons(len), 331 .nexthdr = IPPROTO_ICMPV6, 332 .hop_limit = ip6h->hop_limit, 333 .saddr = ip6h->daddr, 334 .daddr = ip6h->saddr, 335 }; 336 skb_reset_network_header(skb); 337 338 csum = skb_checksum(skb, skb_transport_offset(skb), len, 0); 339 icmp6h->icmp6_cksum = csum_ipv6_magic(&nip6h->saddr, &nip6h->daddr, len, 340 IPPROTO_ICMPV6, csum); 341 342 skb->ip_summed = CHECKSUM_NONE; 343 344 eth_header(skb, skb->dev, ntohs(eh.h_proto), eh.h_source, eh.h_dest, 0); 345 skb_reset_mac_header(skb); 346 347 return skb->len; 348 } 349 350 /** 351 * iptunnel_pmtud_check_icmpv6() - Trigger ICMPv6 reply if needed and allowed 352 * @skb: Buffer being sent by encapsulation, L2 headers expected 353 * @mtu: Network MTU for path 354 * 355 * Return: 0 for no ICMPv6 reply, length if built, negative value on error. 356 */ 357 static int iptunnel_pmtud_check_icmpv6(struct sk_buff *skb, int mtu) 358 { 359 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 360 int stype = ipv6_addr_type(&ip6h->saddr); 361 u8 proto = ip6h->nexthdr; 362 __be16 frag_off; 363 int offset; 364 365 if (mtu < IPV6_MIN_MTU) 366 return 0; 367 368 if (stype == IPV6_ADDR_ANY || stype == IPV6_ADDR_MULTICAST || 369 stype == IPV6_ADDR_LOOPBACK) 370 return 0; 371 372 offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &proto, 373 &frag_off); 374 if (offset < 0 || (frag_off & htons(~0x7))) 375 return 0; 376 377 if (proto == IPPROTO_ICMPV6) { 378 struct icmp6hdr *icmp6h; 379 380 if (!pskb_may_pull(skb, skb_network_header(skb) + 381 offset + 1 - skb->data)) 382 return 0; 383 384 icmp6h = (struct icmp6hdr *)(skb_network_header(skb) + offset); 385 if (icmpv6_is_err(icmp6h->icmp6_type) || 386 icmp6h->icmp6_type == NDISC_REDIRECT) 387 return 0; 388 } 389 390 return iptunnel_pmtud_build_icmpv6(skb, mtu); 391 } 392 #endif /* IS_ENABLED(CONFIG_IPV6) */ 393 394 /** 395 * skb_tunnel_check_pmtu() - Check, update PMTU and trigger ICMP reply as needed 396 * @skb: Buffer being sent by encapsulation, L2 headers expected 397 * @encap_dst: Destination for tunnel encapsulation (outer IP) 398 * @headroom: Encapsulation header size, bytes 399 * @reply: Build matching ICMP or ICMPv6 message as a result 400 * 401 * L2 tunnel implementations that can carry IP and can be directly bridged 402 * (currently UDP tunnels) can't always rely on IP forwarding paths to handle 403 * PMTU discovery. In the bridged case, ICMP or ICMPv6 messages need to be built 404 * based on payload and sent back by the encapsulation itself. 405 * 406 * For routable interfaces, we just need to update the PMTU for the destination. 407 * 408 * Return: 0 if ICMP error not needed, length if built, negative value on error 409 */ 410 int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst, 411 int headroom, bool reply) 412 { 413 u32 mtu = dst_mtu(encap_dst) - headroom; 414 415 if ((skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) || 416 (!skb_is_gso(skb) && (skb->len - skb_network_offset(skb)) <= mtu)) 417 return 0; 418 419 skb_dst_update_pmtu_no_confirm(skb, mtu); 420 421 if (!reply) 422 return 0; 423 424 if (skb->protocol == htons(ETH_P_IP)) 425 return iptunnel_pmtud_check_icmp(skb, mtu); 426 427 #if IS_ENABLED(CONFIG_IPV6) 428 if (skb->protocol == htons(ETH_P_IPV6)) 429 return iptunnel_pmtud_check_icmpv6(skb, mtu); 430 #endif 431 return 0; 432 } 433 EXPORT_SYMBOL(skb_tunnel_check_pmtu); 434 435 static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = { 436 [LWTUNNEL_IP_UNSPEC] = { .strict_start_type = LWTUNNEL_IP_OPTS }, 437 [LWTUNNEL_IP_ID] = { .type = NLA_U64 }, 438 [LWTUNNEL_IP_DST] = { .type = NLA_U32 }, 439 [LWTUNNEL_IP_SRC] = { .type = NLA_U32 }, 440 [LWTUNNEL_IP_TTL] = { .type = NLA_U8 }, 441 [LWTUNNEL_IP_TOS] = { .type = NLA_U8 }, 442 [LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 }, 443 [LWTUNNEL_IP_OPTS] = { .type = NLA_NESTED }, 444 }; 445 446 static const struct nla_policy ip_opts_policy[LWTUNNEL_IP_OPTS_MAX + 1] = { 447 [LWTUNNEL_IP_OPTS_GENEVE] = { .type = NLA_NESTED }, 448 [LWTUNNEL_IP_OPTS_VXLAN] = { .type = NLA_NESTED }, 449 [LWTUNNEL_IP_OPTS_ERSPAN] = { .type = NLA_NESTED }, 450 }; 451 452 static const struct nla_policy 453 geneve_opt_policy[LWTUNNEL_IP_OPT_GENEVE_MAX + 1] = { 454 [LWTUNNEL_IP_OPT_GENEVE_CLASS] = { .type = NLA_U16 }, 455 [LWTUNNEL_IP_OPT_GENEVE_TYPE] = { .type = NLA_U8 }, 456 [LWTUNNEL_IP_OPT_GENEVE_DATA] = { .type = NLA_BINARY, .len = 127 }, 457 }; 458 459 static const struct nla_policy 460 vxlan_opt_policy[LWTUNNEL_IP_OPT_VXLAN_MAX + 1] = { 461 [LWTUNNEL_IP_OPT_VXLAN_GBP] = { .type = NLA_U32 }, 462 }; 463 464 static const struct nla_policy 465 erspan_opt_policy[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1] = { 466 [LWTUNNEL_IP_OPT_ERSPAN_VER] = { .type = NLA_U8 }, 467 [LWTUNNEL_IP_OPT_ERSPAN_INDEX] = { .type = NLA_U32 }, 468 [LWTUNNEL_IP_OPT_ERSPAN_DIR] = { .type = NLA_U8 }, 469 [LWTUNNEL_IP_OPT_ERSPAN_HWID] = { .type = NLA_U8 }, 470 }; 471 472 static int ip_tun_parse_opts_geneve(struct nlattr *attr, 473 struct ip_tunnel_info *info, int opts_len, 474 struct netlink_ext_ack *extack) 475 { 476 struct nlattr *tb[LWTUNNEL_IP_OPT_GENEVE_MAX + 1]; 477 int data_len, err; 478 479 err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_GENEVE_MAX, attr, 480 geneve_opt_policy, extack); 481 if (err) 482 return err; 483 484 if (!tb[LWTUNNEL_IP_OPT_GENEVE_CLASS] || 485 !tb[LWTUNNEL_IP_OPT_GENEVE_TYPE] || 486 !tb[LWTUNNEL_IP_OPT_GENEVE_DATA]) 487 return -EINVAL; 488 489 attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA]; 490 data_len = nla_len(attr); 491 if (data_len % 4) 492 return -EINVAL; 493 494 if (info) { 495 struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len; 496 497 memcpy(opt->opt_data, nla_data(attr), data_len); 498 opt->length = data_len / 4; 499 attr = tb[LWTUNNEL_IP_OPT_GENEVE_CLASS]; 500 opt->opt_class = nla_get_be16(attr); 501 attr = tb[LWTUNNEL_IP_OPT_GENEVE_TYPE]; 502 opt->type = nla_get_u8(attr); 503 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, info->key.tun_flags); 504 } 505 506 return sizeof(struct geneve_opt) + data_len; 507 } 508 509 static int ip_tun_parse_opts_vxlan(struct nlattr *attr, 510 struct ip_tunnel_info *info, int opts_len, 511 struct netlink_ext_ack *extack) 512 { 513 struct nlattr *tb[LWTUNNEL_IP_OPT_VXLAN_MAX + 1]; 514 int err; 515 516 err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_VXLAN_MAX, attr, 517 vxlan_opt_policy, extack); 518 if (err) 519 return err; 520 521 if (!tb[LWTUNNEL_IP_OPT_VXLAN_GBP]) 522 return -EINVAL; 523 524 if (info) { 525 struct vxlan_metadata *md = 526 ip_tunnel_info_opts(info) + opts_len; 527 528 attr = tb[LWTUNNEL_IP_OPT_VXLAN_GBP]; 529 md->gbp = nla_get_u32(attr); 530 md->gbp &= VXLAN_GBP_MASK; 531 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, info->key.tun_flags); 532 } 533 534 return sizeof(struct vxlan_metadata); 535 } 536 537 static int ip_tun_parse_opts_erspan(struct nlattr *attr, 538 struct ip_tunnel_info *info, int opts_len, 539 struct netlink_ext_ack *extack) 540 { 541 struct nlattr *tb[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1]; 542 int err; 543 u8 ver; 544 545 err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_ERSPAN_MAX, attr, 546 erspan_opt_policy, extack); 547 if (err) 548 return err; 549 550 if (!tb[LWTUNNEL_IP_OPT_ERSPAN_VER]) 551 return -EINVAL; 552 553 ver = nla_get_u8(tb[LWTUNNEL_IP_OPT_ERSPAN_VER]); 554 if (ver == 1) { 555 if (!tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX]) 556 return -EINVAL; 557 } else if (ver == 2) { 558 if (!tb[LWTUNNEL_IP_OPT_ERSPAN_DIR] || 559 !tb[LWTUNNEL_IP_OPT_ERSPAN_HWID]) 560 return -EINVAL; 561 } else { 562 return -EINVAL; 563 } 564 565 if (info) { 566 struct erspan_metadata *md = 567 ip_tunnel_info_opts(info) + opts_len; 568 569 md->version = ver; 570 if (ver == 1) { 571 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX]; 572 md->u.index = nla_get_be32(attr); 573 } else { 574 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_DIR]; 575 md->u.md2.dir = nla_get_u8(attr); 576 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_HWID]; 577 set_hwid(&md->u.md2, nla_get_u8(attr)); 578 } 579 580 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, info->key.tun_flags); 581 } 582 583 return sizeof(struct erspan_metadata); 584 } 585 586 static int ip_tun_parse_opts(struct nlattr *attr, struct ip_tunnel_info *info, 587 struct netlink_ext_ack *extack) 588 { 589 int err, rem, opt_len, opts_len = 0; 590 struct nlattr *nla; 591 u32 type = 0; 592 593 if (!attr) 594 return 0; 595 596 err = nla_validate(nla_data(attr), nla_len(attr), LWTUNNEL_IP_OPTS_MAX, 597 ip_opts_policy, extack); 598 if (err) 599 return err; 600 601 nla_for_each_attr(nla, nla_data(attr), nla_len(attr), rem) { 602 switch (nla_type(nla)) { 603 case LWTUNNEL_IP_OPTS_GENEVE: 604 if (type && type != IP_TUNNEL_GENEVE_OPT_BIT) 605 return -EINVAL; 606 opt_len = ip_tun_parse_opts_geneve(nla, info, opts_len, 607 extack); 608 if (opt_len < 0) 609 return opt_len; 610 opts_len += opt_len; 611 if (opts_len > IP_TUNNEL_OPTS_MAX) 612 return -EINVAL; 613 type = IP_TUNNEL_GENEVE_OPT_BIT; 614 break; 615 case LWTUNNEL_IP_OPTS_VXLAN: 616 if (type) 617 return -EINVAL; 618 opt_len = ip_tun_parse_opts_vxlan(nla, info, opts_len, 619 extack); 620 if (opt_len < 0) 621 return opt_len; 622 opts_len += opt_len; 623 type = IP_TUNNEL_VXLAN_OPT_BIT; 624 break; 625 case LWTUNNEL_IP_OPTS_ERSPAN: 626 if (type) 627 return -EINVAL; 628 opt_len = ip_tun_parse_opts_erspan(nla, info, opts_len, 629 extack); 630 if (opt_len < 0) 631 return opt_len; 632 opts_len += opt_len; 633 type = IP_TUNNEL_ERSPAN_OPT_BIT; 634 break; 635 default: 636 return -EINVAL; 637 } 638 } 639 640 return opts_len; 641 } 642 643 static int ip_tun_get_optlen(struct nlattr *attr, 644 struct netlink_ext_ack *extack) 645 { 646 return ip_tun_parse_opts(attr, NULL, extack); 647 } 648 649 static int ip_tun_set_opts(struct nlattr *attr, struct ip_tunnel_info *info, 650 struct netlink_ext_ack *extack) 651 { 652 return ip_tun_parse_opts(attr, info, extack); 653 } 654 655 static int ip_tun_build_state(struct net *net, struct nlattr *attr, 656 unsigned int family, const void *cfg, 657 struct lwtunnel_state **ts, 658 struct netlink_ext_ack *extack) 659 { 660 struct nlattr *tb[LWTUNNEL_IP_MAX + 1]; 661 struct lwtunnel_state *new_state; 662 struct ip_tunnel_info *tun_info; 663 int err, opt_len; 664 665 err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_MAX, attr, 666 ip_tun_policy, extack); 667 if (err < 0) 668 return err; 669 670 opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP_OPTS], extack); 671 if (opt_len < 0) 672 return opt_len; 673 674 new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len); 675 if (!new_state) 676 return -ENOMEM; 677 678 new_state->type = LWTUNNEL_ENCAP_IP; 679 680 tun_info = lwt_tun_info(new_state); 681 682 err = ip_tun_set_opts(tb[LWTUNNEL_IP_OPTS], tun_info, extack); 683 if (err < 0) { 684 lwtstate_free(new_state); 685 return err; 686 } 687 688 #ifdef CONFIG_DST_CACHE 689 err = dst_cache_init(&tun_info->dst_cache, GFP_KERNEL); 690 if (err) { 691 lwtstate_free(new_state); 692 return err; 693 } 694 #endif 695 696 if (tb[LWTUNNEL_IP_ID]) 697 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]); 698 699 if (tb[LWTUNNEL_IP_DST]) 700 tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]); 701 702 if (tb[LWTUNNEL_IP_SRC]) 703 tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]); 704 705 if (tb[LWTUNNEL_IP_TTL]) 706 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]); 707 708 if (tb[LWTUNNEL_IP_TOS]) 709 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]); 710 711 if (tb[LWTUNNEL_IP_FLAGS]) { 712 IP_TUNNEL_DECLARE_FLAGS(flags); 713 714 ip_tunnel_flags_from_be16(flags, 715 nla_get_be16(tb[LWTUNNEL_IP_FLAGS])); 716 ip_tunnel_clear_options_present(flags); 717 718 ip_tunnel_flags_or(tun_info->key.tun_flags, 719 tun_info->key.tun_flags, flags); 720 } 721 722 tun_info->mode = IP_TUNNEL_INFO_TX; 723 tun_info->options_len = opt_len; 724 725 *ts = new_state; 726 727 return 0; 728 } 729 730 static void ip_tun_destroy_state(struct lwtunnel_state *lwtstate) 731 { 732 #ifdef CONFIG_DST_CACHE 733 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); 734 735 dst_cache_destroy(&tun_info->dst_cache); 736 #endif 737 } 738 739 static int ip_tun_fill_encap_opts_geneve(struct sk_buff *skb, 740 struct ip_tunnel_info *tun_info) 741 { 742 struct geneve_opt *opt; 743 struct nlattr *nest; 744 int offset = 0; 745 746 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_GENEVE); 747 if (!nest) 748 return -ENOMEM; 749 750 while (tun_info->options_len > offset) { 751 opt = ip_tunnel_info_opts(tun_info) + offset; 752 if (nla_put_be16(skb, LWTUNNEL_IP_OPT_GENEVE_CLASS, 753 opt->opt_class) || 754 nla_put_u8(skb, LWTUNNEL_IP_OPT_GENEVE_TYPE, opt->type) || 755 nla_put(skb, LWTUNNEL_IP_OPT_GENEVE_DATA, opt->length * 4, 756 opt->opt_data)) { 757 nla_nest_cancel(skb, nest); 758 return -ENOMEM; 759 } 760 offset += sizeof(*opt) + opt->length * 4; 761 } 762 763 nla_nest_end(skb, nest); 764 return 0; 765 } 766 767 static int ip_tun_fill_encap_opts_vxlan(struct sk_buff *skb, 768 struct ip_tunnel_info *tun_info) 769 { 770 struct vxlan_metadata *md; 771 struct nlattr *nest; 772 773 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_VXLAN); 774 if (!nest) 775 return -ENOMEM; 776 777 md = ip_tunnel_info_opts(tun_info); 778 if (nla_put_u32(skb, LWTUNNEL_IP_OPT_VXLAN_GBP, md->gbp)) { 779 nla_nest_cancel(skb, nest); 780 return -ENOMEM; 781 } 782 783 nla_nest_end(skb, nest); 784 return 0; 785 } 786 787 static int ip_tun_fill_encap_opts_erspan(struct sk_buff *skb, 788 struct ip_tunnel_info *tun_info) 789 { 790 struct erspan_metadata *md; 791 struct nlattr *nest; 792 793 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_ERSPAN); 794 if (!nest) 795 return -ENOMEM; 796 797 md = ip_tunnel_info_opts(tun_info); 798 if (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_VER, md->version)) 799 goto err; 800 801 if (md->version == 1 && 802 nla_put_be32(skb, LWTUNNEL_IP_OPT_ERSPAN_INDEX, md->u.index)) 803 goto err; 804 805 if (md->version == 2 && 806 (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_DIR, md->u.md2.dir) || 807 nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_HWID, 808 get_hwid(&md->u.md2)))) 809 goto err; 810 811 nla_nest_end(skb, nest); 812 return 0; 813 err: 814 nla_nest_cancel(skb, nest); 815 return -ENOMEM; 816 } 817 818 static int ip_tun_fill_encap_opts(struct sk_buff *skb, int type, 819 struct ip_tunnel_info *tun_info) 820 { 821 struct nlattr *nest; 822 int err = 0; 823 824 if (!ip_tunnel_is_options_present(tun_info->key.tun_flags)) 825 return 0; 826 827 nest = nla_nest_start_noflag(skb, type); 828 if (!nest) 829 return -ENOMEM; 830 831 if (test_bit(IP_TUNNEL_GENEVE_OPT_BIT, tun_info->key.tun_flags)) 832 err = ip_tun_fill_encap_opts_geneve(skb, tun_info); 833 else if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, tun_info->key.tun_flags)) 834 err = ip_tun_fill_encap_opts_vxlan(skb, tun_info); 835 else if (test_bit(IP_TUNNEL_ERSPAN_OPT_BIT, tun_info->key.tun_flags)) 836 err = ip_tun_fill_encap_opts_erspan(skb, tun_info); 837 838 if (err) { 839 nla_nest_cancel(skb, nest); 840 return err; 841 } 842 843 nla_nest_end(skb, nest); 844 return 0; 845 } 846 847 static int ip_tun_fill_encap_info(struct sk_buff *skb, 848 struct lwtunnel_state *lwtstate) 849 { 850 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); 851 852 if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id, 853 LWTUNNEL_IP_PAD) || 854 nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) || 855 nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) || 856 nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) || 857 nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) || 858 nla_put_be16(skb, LWTUNNEL_IP_FLAGS, 859 ip_tunnel_flags_to_be16(tun_info->key.tun_flags)) || 860 ip_tun_fill_encap_opts(skb, LWTUNNEL_IP_OPTS, tun_info)) 861 return -ENOMEM; 862 863 return 0; 864 } 865 866 static int ip_tun_opts_nlsize(struct ip_tunnel_info *info) 867 { 868 int opt_len; 869 870 if (!ip_tunnel_is_options_present(info->key.tun_flags)) 871 return 0; 872 873 opt_len = nla_total_size(0); /* LWTUNNEL_IP_OPTS */ 874 if (test_bit(IP_TUNNEL_GENEVE_OPT_BIT, info->key.tun_flags)) { 875 struct geneve_opt *opt; 876 int offset = 0; 877 878 opt_len += nla_total_size(0); /* LWTUNNEL_IP_OPTS_GENEVE */ 879 while (info->options_len > offset) { 880 opt = ip_tunnel_info_opts(info) + offset; 881 opt_len += nla_total_size(2) /* OPT_GENEVE_CLASS */ 882 + nla_total_size(1) /* OPT_GENEVE_TYPE */ 883 + nla_total_size(opt->length * 4); 884 /* OPT_GENEVE_DATA */ 885 offset += sizeof(*opt) + opt->length * 4; 886 } 887 } else if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, info->key.tun_flags)) { 888 opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_VXLAN */ 889 + nla_total_size(4); /* OPT_VXLAN_GBP */ 890 } else if (test_bit(IP_TUNNEL_ERSPAN_OPT_BIT, info->key.tun_flags)) { 891 struct erspan_metadata *md = ip_tunnel_info_opts(info); 892 893 opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_ERSPAN */ 894 + nla_total_size(1) /* OPT_ERSPAN_VER */ 895 + (md->version == 1 ? nla_total_size(4) 896 /* OPT_ERSPAN_INDEX (v1) */ 897 : nla_total_size(1) + 898 nla_total_size(1)); 899 /* OPT_ERSPAN_DIR + HWID (v2) */ 900 } 901 902 return opt_len; 903 } 904 905 static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate) 906 { 907 return nla_total_size_64bit(8) /* LWTUNNEL_IP_ID */ 908 + nla_total_size(4) /* LWTUNNEL_IP_DST */ 909 + nla_total_size(4) /* LWTUNNEL_IP_SRC */ 910 + nla_total_size(1) /* LWTUNNEL_IP_TOS */ 911 + nla_total_size(1) /* LWTUNNEL_IP_TTL */ 912 + nla_total_size(2) /* LWTUNNEL_IP_FLAGS */ 913 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate)); 914 /* LWTUNNEL_IP_OPTS */ 915 } 916 917 static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b) 918 { 919 struct ip_tunnel_info *info_a = lwt_tun_info(a); 920 struct ip_tunnel_info *info_b = lwt_tun_info(b); 921 922 return memcmp(info_a, info_b, sizeof(info_a->key)) || 923 info_a->mode != info_b->mode || 924 info_a->options_len != info_b->options_len || 925 memcmp(ip_tunnel_info_opts(info_a), 926 ip_tunnel_info_opts(info_b), info_a->options_len); 927 } 928 929 static const struct lwtunnel_encap_ops ip_tun_lwt_ops = { 930 .build_state = ip_tun_build_state, 931 .destroy_state = ip_tun_destroy_state, 932 .fill_encap = ip_tun_fill_encap_info, 933 .get_encap_size = ip_tun_encap_nlsize, 934 .cmp_encap = ip_tun_cmp_encap, 935 .owner = THIS_MODULE, 936 }; 937 938 static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = { 939 [LWTUNNEL_IP6_UNSPEC] = { .strict_start_type = LWTUNNEL_IP6_OPTS }, 940 [LWTUNNEL_IP6_ID] = { .type = NLA_U64 }, 941 [LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) }, 942 [LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) }, 943 [LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 }, 944 [LWTUNNEL_IP6_TC] = { .type = NLA_U8 }, 945 [LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 }, 946 [LWTUNNEL_IP6_OPTS] = { .type = NLA_NESTED }, 947 }; 948 949 static int ip6_tun_build_state(struct net *net, struct nlattr *attr, 950 unsigned int family, const void *cfg, 951 struct lwtunnel_state **ts, 952 struct netlink_ext_ack *extack) 953 { 954 struct nlattr *tb[LWTUNNEL_IP6_MAX + 1]; 955 struct lwtunnel_state *new_state; 956 struct ip_tunnel_info *tun_info; 957 int err, opt_len; 958 959 err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP6_MAX, attr, 960 ip6_tun_policy, extack); 961 if (err < 0) 962 return err; 963 964 opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP6_OPTS], extack); 965 if (opt_len < 0) 966 return opt_len; 967 968 new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len); 969 if (!new_state) 970 return -ENOMEM; 971 972 new_state->type = LWTUNNEL_ENCAP_IP6; 973 974 tun_info = lwt_tun_info(new_state); 975 976 err = ip_tun_set_opts(tb[LWTUNNEL_IP6_OPTS], tun_info, extack); 977 if (err < 0) { 978 lwtstate_free(new_state); 979 return err; 980 } 981 982 if (tb[LWTUNNEL_IP6_ID]) 983 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]); 984 985 if (tb[LWTUNNEL_IP6_DST]) 986 tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]); 987 988 if (tb[LWTUNNEL_IP6_SRC]) 989 tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]); 990 991 if (tb[LWTUNNEL_IP6_HOPLIMIT]) 992 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]); 993 994 if (tb[LWTUNNEL_IP6_TC]) 995 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]); 996 997 if (tb[LWTUNNEL_IP6_FLAGS]) { 998 IP_TUNNEL_DECLARE_FLAGS(flags); 999 __be16 data; 1000 1001 data = nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]); 1002 ip_tunnel_flags_from_be16(flags, data); 1003 ip_tunnel_clear_options_present(flags); 1004 1005 ip_tunnel_flags_or(tun_info->key.tun_flags, 1006 tun_info->key.tun_flags, flags); 1007 } 1008 1009 tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6; 1010 tun_info->options_len = opt_len; 1011 1012 *ts = new_state; 1013 1014 return 0; 1015 } 1016 1017 static int ip6_tun_fill_encap_info(struct sk_buff *skb, 1018 struct lwtunnel_state *lwtstate) 1019 { 1020 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); 1021 1022 if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id, 1023 LWTUNNEL_IP6_PAD) || 1024 nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) || 1025 nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) || 1026 nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) || 1027 nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) || 1028 nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, 1029 ip_tunnel_flags_to_be16(tun_info->key.tun_flags)) || 1030 ip_tun_fill_encap_opts(skb, LWTUNNEL_IP6_OPTS, tun_info)) 1031 return -ENOMEM; 1032 1033 return 0; 1034 } 1035 1036 static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate) 1037 { 1038 return nla_total_size_64bit(8) /* LWTUNNEL_IP6_ID */ 1039 + nla_total_size(16) /* LWTUNNEL_IP6_DST */ 1040 + nla_total_size(16) /* LWTUNNEL_IP6_SRC */ 1041 + nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */ 1042 + nla_total_size(1) /* LWTUNNEL_IP6_TC */ 1043 + nla_total_size(2) /* LWTUNNEL_IP6_FLAGS */ 1044 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate)); 1045 /* LWTUNNEL_IP6_OPTS */ 1046 } 1047 1048 static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = { 1049 .build_state = ip6_tun_build_state, 1050 .fill_encap = ip6_tun_fill_encap_info, 1051 .get_encap_size = ip6_tun_encap_nlsize, 1052 .cmp_encap = ip_tun_cmp_encap, 1053 .owner = THIS_MODULE, 1054 }; 1055 1056 void __init ip_tunnel_core_init(void) 1057 { 1058 /* If you land here, make sure whether increasing ip_tunnel_info's 1059 * options_len is a reasonable choice with its usage in front ends 1060 * (f.e., it's part of flow keys, etc). 1061 */ 1062 BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255); 1063 1064 lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP); 1065 lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6); 1066 } 1067 1068 DEFINE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt); 1069 EXPORT_SYMBOL(ip_tunnel_metadata_cnt); 1070 1071 void ip_tunnel_need_metadata(void) 1072 { 1073 static_branch_inc(&ip_tunnel_metadata_cnt); 1074 } 1075 EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata); 1076 1077 void ip_tunnel_unneed_metadata(void) 1078 { 1079 static_branch_dec(&ip_tunnel_metadata_cnt); 1080 } 1081 EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata); 1082 1083 /* Returns either the correct skb->protocol value, or 0 if invalid. */ 1084 __be16 ip_tunnel_parse_protocol(const struct sk_buff *skb) 1085 { 1086 if (skb_network_header(skb) >= skb->head && 1087 (skb_network_header(skb) + sizeof(struct iphdr)) <= skb_tail_pointer(skb) && 1088 ip_hdr(skb)->version == 4) 1089 return htons(ETH_P_IP); 1090 if (skb_network_header(skb) >= skb->head && 1091 (skb_network_header(skb) + sizeof(struct ipv6hdr)) <= skb_tail_pointer(skb) && 1092 ipv6_hdr(skb)->version == 6) 1093 return htons(ETH_P_IPV6); 1094 return 0; 1095 } 1096 EXPORT_SYMBOL(ip_tunnel_parse_protocol); 1097 1098 const struct header_ops ip_tunnel_header_ops = { .parse_protocol = ip_tunnel_parse_protocol }; 1099 EXPORT_SYMBOL(ip_tunnel_header_ops); 1100 1101 /* This function returns true when ENCAP attributes are present in the nl msg */ 1102 bool ip_tunnel_netlink_encap_parms(struct nlattr *data[], 1103 struct ip_tunnel_encap *encap) 1104 { 1105 bool ret = false; 1106 1107 memset(encap, 0, sizeof(*encap)); 1108 1109 if (!data) 1110 return ret; 1111 1112 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1113 ret = true; 1114 encap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1115 } 1116 1117 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1118 ret = true; 1119 encap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1120 } 1121 1122 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1123 ret = true; 1124 encap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1125 } 1126 1127 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1128 ret = true; 1129 encap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1130 } 1131 1132 return ret; 1133 } 1134 EXPORT_SYMBOL_GPL(ip_tunnel_netlink_encap_parms); 1135 1136 void ip_tunnel_netlink_parms(struct nlattr *data[], 1137 struct ip_tunnel_parm_kern *parms) 1138 { 1139 if (data[IFLA_IPTUN_LINK]) 1140 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1141 1142 if (data[IFLA_IPTUN_LOCAL]) 1143 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); 1144 1145 if (data[IFLA_IPTUN_REMOTE]) 1146 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); 1147 1148 if (data[IFLA_IPTUN_TTL]) { 1149 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 1150 if (parms->iph.ttl) 1151 parms->iph.frag_off = htons(IP_DF); 1152 } 1153 1154 if (data[IFLA_IPTUN_TOS]) 1155 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 1156 1157 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 1158 parms->iph.frag_off = htons(IP_DF); 1159 1160 if (data[IFLA_IPTUN_FLAGS]) { 1161 __be16 flags; 1162 1163 flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); 1164 ip_tunnel_flags_from_be16(parms->i_flags, flags); 1165 } 1166 1167 if (data[IFLA_IPTUN_PROTO]) 1168 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1169 } 1170 EXPORT_SYMBOL_GPL(ip_tunnel_netlink_parms); 1171